I have setup an NTP Server on a Windows Server 2008.
The Time synchronization works with Windows Clients and Non Domain Clients but now i have switches that want to authenticate against NTP Server and sending Auth Codes.
I haven't configured any NTP auth and I'm not sure if windows ntp server are able to authenticate these clients.
So far i haven't figured out how to disable authentication on my switches even so i haven't enabled this feature.
Is Windows Server NTP Serber able to authenticate non-domain clients?
Best Answer
From TechNet:
So in order to use authentication with Windows Time, you need Active Directory domain membership.
I don't believe you can disable authentication in IOS (guessing - I don't know what kind of network switch you're using) or fall back to using SNTP. So, if you have to sync this switch to this Windows Server, your only remaining option may be to disable Windows Time and install an NTP v4 server. (Which would probably negatively affect your Windows clients.)
See this Cisco post for a corroboration of what I just said:
https://supportforums.cisco.com/document/7176/ntp-common-issues-and-troubleshooting#Sync_to_W32_based_time_service_Most_Windows_Implimentations
Also see this other Serverfault post:
Cisco ASA5505 won't sync with NTP